JP2014519217A5 - - Google Patents

Claims (9)

A switching device for connecting / disconnecting an appliance or device to / from a power grid, the switching device being coupled to the power network via at least one input terminal, the switching device comprising:
A bidirectional semiconductor switch;
A bias supply circuit coupled to the at least one input terminal for generating a floating auxiliary voltage from the power network using at least one capacitor;
A switching device having a switching control circuit that will be powered by the floating auxiliary voltage,
The switching device has a separation circuit;
The switching control circuit is a supply voltage supplied through the bias supply circuit, the appearance of the supply voltage derived from the power grid, or, in at least one control signal supplied via the isolation circuit In response, adapted to turn on the bidirectional semiconductor switch ,
The switching control circuit includes a latch circuit, and the separation circuit supplies the at least one control signal to a signal processing circuit for generating a control command to be supplied to the latch circuit. A switching device comprising an optical coupler .   The switching device according to claim 1, further comprising a randomizer that delays the operation of the semiconductor switch in response to the stop of the supply voltage.   The switching device of claim 1, wherein the semiconductor switch comprises at least two metal oxide semiconductor field effect transistors or at least two insulated gate bipolar transistors.   The bias supply circuit has a series connection of a zener diode and the at least one capacitor adapted to limit the supply voltage derived from the power network, and a supply voltage limited to obtain the floating auxiliary voltage. The switching device according to claim 1, further comprising a diode for rectification.   The switching device according to claim 4, further comprising a buffer capacitor for buffering the floating auxiliary voltage. The switching device according to any one of claims 1 to 5 , wherein the latch circuit includes a bistable flip-flop. Further comprising a monitoring circuit adapted to detect the floating auxiliary voltage and to provide a control signal to the latch circuit when the floating auxiliary voltage is lower than a predetermined threshold;
The switching device according to claim 1 , wherein the control signal triggers a dominant reset of the semiconductor switch. Determining the energy level of the energy storage element in the device, said energy level other adapted to other control signals is lower than a predetermined threshold value is supplied to the latch circuit of the energy storage element A monitoring circuit;
8. A switching device according to any one of the preceding claims , wherein the control signal triggers a turn-on cycle of the semiconductor switch by a subsequent recharge of the energy storage element of the device. The monitoring circuit includes a transistor that is activated by the auxiliary voltage when the auxiliary voltage reaches its nominal value;
The transistor is coupled such that the transistor is activated by a current flowing through the Zener diode;
9. The switching device according to claim 1 , wherein a collector voltage of the transistor is an output signal of the monitoring circuit supplied to an input terminal of the latch circuit.